![southernpacific sp coaltrain unionpacific up curve tunnel1 plainview plain formerriogrande upmoffattunnelsubdivision moffattunnelsub railroad locomotive ge ac4400cw 345 colorado co](https://live.staticflickr.com/5595/30667965493_7b3c462faf.jpg)
View at Tunnel 1
![snow fog firstflatiron flagstaffmountain mountain canyon gregorycanyon boulder colorado bouldercountyopenspaceandmountainparks landscape earthnaturelife wondersofnature](https://live.staticflickr.com/65535/49152241358_482ca1769b.jpg)
Boulder Buried In Snow, Shrouded in Fog
![sunrise flatirons cuboulder aviewworthlowerpay tuscanarchitecture greenmountain newsnow universityofcoloradoboulder](https://live.staticflickr.com/65535/48960127626_70f8423e19.jpg)
Retention View
![bighornmountain goldhillroad bouldercounty firescars forestfires fourmilecanyonfire flagstafffire](https://live.staticflickr.com/65535/49483154386_7271ace5d8.jpg)
Mountain layers: burn scars
![canoneos5dmarkiv rokinon14mm royalarch boulder denver colorado lookout trail rocks flatirons hike hiking arch chataqua bluemesa climb summer co 2017 wideangle](https://live.staticflickr.com/4488/37417921536_29e0d5bc76.jpg)
royal arch
![lichen mutualism predation bouldercountyopenspaceandmountainparks macro earthnaturelife wondersofnature](https://live.staticflickr.com/65535/49079529042_552b7ae0b7.jpg)
Lichen Community
![snow dirtroad stonewall](https://live.staticflickr.com/65535/49218190366_55b29441d7.jpg)
Old stone wall
![southernpacific sp unionpacific up coaltrain coalempty clay rocky colorado train locomotive railroad upmoffattunnelsub ge ac4400cw 314 big10curve hoppers co](https://live.staticflickr.com/1754/42459542661_b42cf62bf3.jpg)
Climbing into Clay
![orchid cymbidium yellow tropical greenhouse universityofcolorado departmentofecologyandevolutionarybiology flower earthnaturelife wondersofnature](https://live.staticflickr.com/4893/33113885568_26a08ae329.jpg)
Yellow Orchid
![sunrise jamespeak parrypeak southernrockymountains colorado frontrange winter snow](https://live.staticflickr.com/4469/37444730626_816c7e73ab.jpg)
Autumn falls to winter
![moon moonrise frostmoon beavermoon fullmoon pinusponderosa pine pineneedles bluehour clouds boulder bouldercounty southboulder highplains plains colorado supermoon](https://live.staticflickr.com/4170/34688557885_2059309803.jpg)
Moon Slippers
![](https://live.staticflickr.com/8461/8056796015_5a10bfaaba.jpg)
Infinite Aspen
![boulder colorado unitedstatesofamerica mountain rock nature adventure man landscape outdoors wilderness travel people standing hill mountainrange recreation panoramic hiking vacation hike mountainouslandforms outdoor person ridge rocky badlands clothing geology scenery sky background hillside canon7dmarkii ef2470mm sanden view outside](https://live.staticflickr.com/65535/48803859646_caa147de2a.jpg)
Colorado Skyline
![view vista lonetree landscape fromabove fiery expanse boulder mountain colorado sunrise red unitedstates us](https://live.staticflickr.com/5654/30916708292_5b609889ae.jpg)
Sunrise of Fire Mark II
![snow colorado day boulder universityofcolorado springstorm varsitypond](https://live.staticflickr.com/8104/8659600708_1b99dd33f2.jpg)
Springtime in the Rockies
![canoneos5dmarkivef24105mmf4lisusm canoneos5dmarkiv ef24105mmf4lisusm trail fantastic afternoon sunny steps flatirons boulder colorado summer climb royalarch chautauquapark 2017 sunburst flatiron mountains frontrange](https://live.staticflickr.com/4364/37445019821_7bc3b91911.jpg)
trail to royal arch
![meetup littleredridinghood fantasy thumper ericosmann august2012 isitephotography firstclassphotoshoots](https://live.staticflickr.com/8432/7877723884_af304d3c16.jpg)
775: Goodness, what big eyes you have...
![boulder colorado sunrise landscape flatiorns 3rdflatiron hike mountains rockymountains nature canon70d tokina1228](https://live.staticflickr.com/4563/38585547722_988aee1b0a.jpg)
Where the Plains Meet the Rockies
![blue winter sky clouds sunrise colorado frost boulder rockymountains eldoradocanyonstatepark explored](https://live.staticflickr.com/5291/5466771651_e0ece9833a.jpg)
Eldorado Canyon State Park (explored)
![blackandwhite bw creek evening fishing colorado boulder smartphone flyfishing bouldercreek presets winterevening lightroompresets smartphonecamera splittonepreset bouldercreekboulderco ipiccy lgg3 ipiccyframes ipiccyfocus](https://live.staticflickr.com/1512/25269047901_d13f37a4fc.jpg)
Fishing the evening in
![winter snow night colorado boulder canonef35mmf14lusm](https://live.staticflickr.com/7020/6850365659_a43f7bb183.jpg)
Boulder, CO
![superior colorado unitedstates bouldercolorado usa boulderco flatirons flatironsvistatrail mountains landscape panorama canon canon70d canon1585 hike hiking](https://live.staticflickr.com/5199/29582489614_2a5e92e088.jpg)
Flatirons Panorama
![unionpacific up coaltrain dpus dpu ge ac4400cw tunnel27 tunnel pinecliffe cliff colorado train railroad locomotive co](https://live.staticflickr.com/744/31693324161_ce7c6fe284.jpg)
Tunnel 27
![railroad up train colorado rocky co unionpacific locomotive meet bnsf freighttrain cityofdenver manifestfreight little10curve upmoffattunnelsubdivision](https://live.staticflickr.com/7639/26856115455_ab1b719ea7.jpg)
Rocky meet
![burlingtonnorthernsantafe bnsf manifestfreight freighttrain upmoffattunnelsubdivision formerriogrande ge c449w dash9 locomotive train railroad crescent colorado co continentaldivide](https://live.staticflickr.com/8491/29422520012_83cc209df2.jpg)
Spotlight on Crescent
![railroad up train colorado cattle clay sp co unionpacific locomotive ge southernpacific coaltrain dpu ac4400cw big10curve upmoffattunnelsubdivision](https://live.staticflickr.com/7359/27514783046_bc1dda055b.jpg)
Climbing through Clay
![railroad cliff up train colorado sp co unionpacific locomotive curve ge southernpacific coaltrain pinecliffe ac4400cw upmoffattunnelsubdivision](https://live.staticflickr.com/764/23312797179_664ae1ede4.jpg)
SP in spring snow
![amtrak californiazephyr no5 5 t29 tunnel29 cliff pinecliffe colorado upmoffattunnelsubdivision moffattunnelsub tunnel ge p42dc 56 train passengertrain railroad locomotive co](https://live.staticflickr.com/8200/29443883896_ed64312c68.jpg)
Above 29
![unionpacific up coaltrain snow mountains ge ac4400cw 6530 tolland colorado highcountry upmoffattunnelsubdivision moffattunnelsub train railroad locomotive co bridge trestle clouds](https://live.staticflickr.com/8154/29761477686_e8a2ba7e1c.jpg)
Springtime in the mountains
![riograndeskitrain ansco passengertrain emd f40ph 242 tunnle29 pinecliffe colorado tunnel cliff skitrain railroad locomotive upmoffattunnelsub formerriogrande co bouldercreek](https://live.staticflickr.com/4637/24488076177_a9e1eb27ce.jpg)
Grande colors at Tunnel 29
![riograndeskitrain ansco passengertrain skitrain emd f40ph 242 storm tunnel1 plain plainview colorado coalcreekcanyon milepost23 upmoffattunnelsub train railroad locomotive co](https://live.staticflickr.com/1775/43095685255_8b479eeff0.jpg)
Ski Train at milepost 23
![riograndeskitrain passengertrain skitrain emd f40ph rocky colorado upmoffattunnelsub co sktx283 283](https://live.staticflickr.com/4461/37455564172_961c0d09d2.jpg)
Summer Ski Train approaching Rocky
![unionpacific up emd sd90mach testcar 8503 plain plainview coalcreekcanyon formerriogrande upmoffattunnelsub electromotivedivision colorado co tunnel1](https://live.staticflickr.com/4701/39172331935_91a11c5a6e.jpg)
Four locomotives—24,000 h.p.
![amtrak californiazephyr cz ge p42dc heritage phasei phase1 pointlessarrow tunnel1 upmoffattunnelsub formerriogrande plain plainview colorado 156 train5 5 passengertrain co](https://live.staticflickr.com/4627/39588973851_204b69554f.jpg)
Pointless Arrow at Tunnel 1
![sunrise indianpeaks continentaldivide niwotridge fullmoon sugarloafmountain colorado](https://live.staticflickr.com/4862/45745602672_863b19c83e.jpg)
First blush
![moonset hunter’smoon continentaldivide indianpeaks kiowapeak niwotridge coldfingers sugarloafmountain notabadroutetocommutetowork](https://live.staticflickr.com/1942/31692921768_ae416d6d63.jpg)
The Hunter Emerges
![chicagonorthwestern cnw ge ac4400cw 8802 moffat unionpacific up formerriogrande tunnel cliffs rock curve upmoffattunnelsub tunnel29 cliff pinecliffe colorado coaltrain locomotive train railroad co](https://live.staticflickr.com/4794/40967738752_e9dc337188.jpg)
Green and yellow on the Moffat
![cumulusclouds bluehour nederlandcolorado jamespeak airmasscollision](https://live.staticflickr.com/916/43042632601_abfe3746ec.jpg)
When air masses collide
![burlingtonnorthernsantafe bnsf coaltrain curve elevation formerriogrande upmoffattunnelsub train railroad colorado plain plainview clay coalcreekcanyon clouds](https://live.staticflickr.com/7839/47214623431_bcf6f2e9de.jpg)
Coal Creek Canyon coal
![burlingtonnorthernsantafe bnsf coaltrain curve elevation formerriogrande upmoffattunnelsub train railroad colorado clay bluemountaindrive dpu helper sd402 mannedhelper](https://live.staticflickr.com/7891/47214623411_69e0069c21.jpg)
Holdin’ back the tons
![railroad mountains train colorado circus railway trains unionpacific rockymountains passenger railfan railroads moffat ringlingbrotherscircus railroading railfanning passengercars moffatroute rbbb gees44ac coloradorailroads emdsd70m coloradotrains](https://live.staticflickr.com/7645/27624143076_d996d9e1fa.jpg)
Rainbow at Pinecliffe
![sunrise indianpeaks arapahopeaks niwotridge mountalbion kiowapeak snow freshsnow beltofvenus twilightedge](https://live.staticflickr.com/4529/37659879954_c00b6b0b72.jpg)
The edge of Twilight