![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
![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
![flatiron boulder colorado snow ponderosapine conifer winter landscape bouldercountyopenspaceandmountainparks earthnaturelife wondersofnature](https://live.staticflickr.com/65535/50959603492_537b216c64.jpg)
Glimpse of the Flatirons
![snow mountains clouds landscape colorado hiking boulder hike rockymountains frontrange iphone marshallmesa marshallvalleytrail workingproject iphonedng blackwhite](https://live.staticflickr.com/65535/50724762577_37860585ba.jpg)
Front Range View, Boulder, CO
![smoke forestfire bouldercanyon colorado earthnaturelife wondersofnature](https://live.staticflickr.com/65535/50244433601_9f7b1004b8.jpg)
Downwind of the Maelstrom
![earthnaturelife wondersofnature snow mountain skiing forest flatirons boulder colorado landscape scenic bouldercountyopenspaceandmountainparks](https://live.staticflickr.com/65535/49787109697_ea98e9409b.jpg)
All Time Record for Snow
![sunrise flatirons cuboulder aviewworthlowerpay tuscanarchitecture greenmountain newsnow universityofcoloradoboulder](https://live.staticflickr.com/65535/48960127626_70f8423e19.jpg)
Retention View
![bouldercounty colorado eldoradocanyon eldoradocanyonstatepark neowise comet longexposure night nighthiking nightsky nightscape nocturnal stars summer eldoradosprings unitedstatesofamerica](https://live.staticflickr.com/65535/50135492568_0114e90059.jpg)
Neo-Wisdom
![](https://live.staticflickr.com/65535/49772346162_72ee809f14.jpg)
1987 06-27 0822 D&RGW SD40T-2-5399 E/B Plainview, CO
![monsoon summerclouds formations heat colorado highcountry highelevation mountains rockymountains wallart prints weather reflections rollinsville gilpincounty](https://live.staticflickr.com/65535/50115479178_ec6400c8a5.jpg)
Cloud Boiling Up From The Plains
![leica m2 leicam2 voigtlander kodak kodachrome heliar 15mm heliar15 kodachrome64](https://live.staticflickr.com/65535/50444595832_e974310a1a.jpg)
View from Flagstaff, Last of the Kodachrome
![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
![morning trees fog pine forest landscape colorado rocks cliffs hdr rugged textured layered fauxvintage eldoradocanyonstatepark kartpostal](https://live.staticflickr.com/2613/3927172235_14f8ce15b2.jpg)
cliff fog
![anemone boulder bouldercounty boulderopenspace colorado coloradorockies easternpasqueflower pasqueflower pulsatillapatens ranunculaceae rockymountains bokeh flower flowers hirsute macro spring wildflower wildflowers eldoradosprings unitedstatesofamerica](https://live.staticflickr.com/65535/49876069388_16dbe29818.jpg)
Ready and Waiting
![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
![bouldercounty colorado coloradorockies eldoradocanyon eldoradocanyonstatepark lll landscape rockymountains southernrockies clouds crescentmoon darkskies longexposure lowlevellighting moon night nighthiking nightscape noflash nocturnal sky stars thunderstorm eldoradosprings unitedstatesofamerica](https://live.staticflickr.com/65535/50190678791_72fed9d87f.jpg)
Lunar Intrigue
![sunrise jamespeak parrypeak southernrockymountains colorado frontrange winter snow](https://live.staticflickr.com/4469/37444730626_816c7e73ab.jpg)
Autumn falls to winter
![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
![unionpacific up manifestfreight freighttrain emd sd402 3284 formerriogrande upmoffattunnelsubdivision moffattunnelsub tunnel1 plain plainview colorado train locomotive railroad co](https://live.staticflickr.com/5595/30903229141_1f32df4b20.jpg)
Climbing out of Tunnel 1
![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
![railroad trees snow up train colorado co unionpacific locomotive plain whitestuff freighttrain plainview tunnel1 lateautumn manifestfreight mdvpv](https://live.staticflickr.com/669/22545597620_fc136fc9b9.jpg)
Among the white stuff…
![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
![river creek water waterfall women falls rock redrock southbouldercreek eldoradocanyonstatepark hiking colorado jannagalski jannagal woman](https://live.staticflickr.com/1794/42261669670_f9239f9502.jpg)
Falls Below
![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
![railroad train colorado shadows smoke clay co curve exhaust glint skitrain passengertrain northtablemountain riograndeskitrain big10curve upmoffattunnelsubdivision formerriograndeansco](https://live.staticflickr.com/781/23266632062_ecce3e0a38.jpg)
Smokin’ out of Clay
![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
![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
![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
![clouds hiking hike frontrange sky mountains landscape rockymountains iphone colorado boulder bouldermountains doudydrawtrail](https://live.staticflickr.com/65535/50878196111_f3fc1366a5.jpg)
Boulder Mountain Landscape
![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
![town colorado steel rollins co locomotive coil ge bnsf burlingtonnorthernsantafe rollinsville dash9 c449w unittrain coilsteeltrain formerriogrande upmoffattunnelsubdivision](https://live.staticflickr.com/694/23327746075_acb0ba72e1.jpg)
Rollinsville coils
![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
![moonset hunter’smoon continentaldivide indianpeaks kiowapeak niwotridge coldfingers sugarloafmountain notabadroutetocommutetowork](https://live.staticflickr.com/1942/31692921768_ae416d6d63.jpg)
The Hunter Emerges
![riograndeskitrain passengertrain skitrain emd f40ph rocky colorado upmoffattunnelsub co sktx283 283](https://live.staticflickr.com/4461/37455564172_961c0d09d2.jpg)
Summer Ski Train approaching Rocky
![sunrise indianpeaks continentaldivide niwotridge fullmoon sugarloafmountain colorado](https://live.staticflickr.com/4862/45745602672_863b19c83e.jpg)
First blush
![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
![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.
![cumulusclouds bluehour nederlandcolorado jamespeak airmasscollision](https://live.staticflickr.com/916/43042632601_abfe3746ec.jpg)
When air masses collide