Spiral Tunnels (Kicking Horse)

Two official Parks Canada viewpoints provide safe, elevated vantage points over the spiral tunnels. The Lower Spiral Tunnel Viewpoint sits 7.4 km east of Field on the Trans-Canada Highway and looks directly at the east portal of the 891-metre tunnel through Mount Ogden. A raised wooden platform gives clear sightlines of trains entering and exiting, with the head-end often visible while mid-train power is still inside. The Upper Spiral Tunnel Viewpoint is 2.3 km up Yoho Valley Road, overlooking the 991-metre tunnel through Cathedral Mountain.

Trains grind uphill at roughly 15-20 mph (25-30 km/h), with dynamic brakes audibly squealing on downhill movements. CPKC consists are typically 7,500-9,500 ft (2.3-2.9 km) long, so expect each passage to last 8-12 minutes as the full train coils through the tunnels. With Distributed Power Units (mid-train and rear remote locomotives), you get multiple engine passes to photograph per train. A scanner tuned to 161.565 MHz (CP Road 1) gives 10-15 minutes advance warning of approaching traffic.

Both viewpoints have paved parking, interpretive panels explaining the tunnels' history and engineering, and are at safe distances of 150-300 m from the tracks. A Parks Canada Discovery Pass is required for entry to Yoho National Park.

Set at approximately 1,280 m (4,200 ft) above sea level inside Yoho National Park, the viewpoints occupy a narrow valley flanked by sheer limestone cliffs. Mount Ogden rises directly above the Lower Tunnel portal while Cathedral Mountain frames the Upper Tunnel. The surrounding forest is lodgepole pine, Engelmann spruce, and subalpine fir, with wildflowers in the understorey during summer.

Summer daylight stretches past 9 PM, bathing the rails in warm side light during golden hour. Autumn (mid-September to early October) brings golden larches and crisp, clear air — arguably the most photogenic season, though overnight frost is common. Winters are harsh with snow exceeding 1.5 m (5 ft); avalanche control occasionally halts rail traffic, but the contrast of red CPKC locomotives against fresh snow is spectacular for those willing to brave the cold. The Kicking Horse River runs through the valley below, adding water sounds to the rumble of approaching trains.

This is the CPKC (Canadian Pacific Kansas City) transcontinental mainline between Calgary and Vancouver — one of the busiest freight corridors in western Canada. On average, 25-30 trains pass through daily, though not on a fixed schedule. Freight dominates: unit grain trains, potash, mixed manifest, double-stacked intermodal containers, and occasional crude oil trains. Typical motive power includes GE ES44AC and AC4400CW units, often with one or two remote DPU sets positioned mid-train for the mountain grades.

Passenger traffic is limited but photogenic: VIA Rail's "Canadian" (Toronto-Vancouver, twice weekly each direction, year-round) and the luxury Rocky Mountaineer (April-October, daylight hours only). Both slow considerably for the curves, offering extended photo opportunities. The Rocky Mountaineer is particularly popular for its distinctive two-tone blue and gold consist.

Lower Spiral Tunnel Viewpoint (Trans-Canada Highway): The raised wooden platform looks straight onto the east portal of the Mount Ogden tunnel. Morning light (07:30-11:00) illuminates locomotive noses. You can capture the iconic "split-screen" composition: head-end exiting the lower level while the caboose or rear DPU is visible on the upper track above — a double-deck image unique to spiral tunnel locations. A 70-200mm lens is ideal for this shot.

Upper Spiral Tunnel Viewpoint (Yoho Valley Road): From the gravel shoulder, frame trains against Cathedral Mountain with the full curve visible. Midday sun gives front-lit shots; a polarizing filter deepens the forested backdrop. Wider lenses (24-70mm) work well here for context shots showing the mountain scale.

General tips: Bring both telephoto (70-200mm) and wide-angle lenses. A tripod helps for long exposures when morning fog drifts through the valley. Note that tree growth has somewhat obscured views compared to historical photos — telephoto helps punch through gaps. Shutter speeds of 1/500s or faster freeze moving trains; slower speeds (1/60-1/125s) create a sense of motion with panned shots.

The Spiral Tunnels were built to replace the notorious "Big Hill," the steepest section of the original Canadian Pacific Railway main line. When the CPR was completed in 1884, this segment had a punishing 4.5% grade — one of the steepest adhesion railway grades anywhere in the world. The very first train to descend the Big Hill derailed, killing three workers, and runaway accidents continued for 25 years despite safety switches and strict speed limits.

In 1907, the CPR awarded the contract to Vancouver engineering firm MacDonnell, Gzowski and Company. About 1,000 workers blasted through the quartzite rock using black powder and early air drills. The project cost approximately $1.5 million. The tunnels opened on September 1, 1909, reducing the ruling grade to a manageable 2.2% by effectively doubling the length of the climb through two helical loops — a technique borrowed from Swiss mountain railways.

The Lower Tunnel (Mount Ogden) turns 217 degrees over 891 metres (2,923 ft), gaining 15 m (50 ft) of elevation. The Upper Tunnel (Cathedral Mountain) turns 291 degrees over 991 metres (3,251 ft), gaining 17 m (56 ft). If placed portal to portal, the two tunnels would form a figure-8. The engineering has remained virtually unchanged for over a century, with modern CPKC freight trains still using the same tunnels daily.

The Spiral Tunnels are one of the very few places in North America where you can watch a single train cross over its own path — the head-end emerging from a tunnel while the tail is still entering it. The prolonged 8-12 minute passage through the spirals gives photographers ample time to compose and reshoot, a luxury that most high-speed rail corridors don't offer. The two official Parks Canada viewpoints with interpretive signage, paved parking, and safe distances from the tracks make this one of the most accessible mountain railfanning spots on the continent — no trespassing or risky trackside hiking required. The combination of heavy mainline freight traffic (25-30 trains daily), dramatic Rocky Mountain scenery, and century-old engineering visible in action is unmatched.