(CNN) A train speeds across the checkerboard tracks of Chicago's bustling Tower 18 junction, sparks flying from wheels that you can almost hear screeching.

The limited light conditions make nighttime photography both a challenge and a reward.

"We never use flash and rarely use a tripod, so we have to work with whatever light is available," says Coombes.

Rail as a window to the world

The photographers took this shot of a Class SY No. 1771 on a local passenger train at the Tiefa Mine Railway in China.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

Throughout his career, retired rail manager Robin worked with trains. His son Taliesin, 25, shares his father's love both of the railways and photography.

In Chicago, the Coombes men took this photograph at Tower 18 Junction.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

So what's it like working together?

"Competitive, but great fun," says Robin, who adds they both rely on one another -- and challenge each other.

The duo also enjoyed expanding their remit beyond their home country this time round.

Sometimes they just happen to be in the right place and the right time. On other occasions, they tried to capture specific shots while in a particular country.

On a rainy night, a British Rail train Class 168 No. 168216 enters Moor Street Station, in Birmingham in the UK.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

Viewing a country through the lens of their railway is enlightening, says Robin.

"In most cases a railway reflects the culture and prosperity of the country, so a railway in Austria is very different to Eritrea, but no less interesting or exciting to ride," he says.

In Paris, a line 6 train on the Metro is captured crossing the Pont de Bir-Hakeim across the Seine.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

What's often striking about the Coombes' shots is the way they play with perspective and viewer expectation. They rarely shoot simply a chocolate-box, picturesque shot -- although when they do, they do it well.

On New Year's Eve, fireworks explode overhead as a Czech Railways express train approaches Prague.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

Or the photographers focus on their backdrop, take a shot of a train pulling into Prague station -- the viewer's eye is first drawn to the purple-hued New Year fireworks exploding overhead, beforethe railway below becomes apparent.

While the images often speak to an old school romanticism of the railway, they're also usually grounded in realism, as demonstrated in a shot of a British rail train entering Moor Street station in Birmingham, in England, shrouded by pouring rain.

Capturing a scene

A bi-level rail car at Chicago Union Station.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

This new collection of photographs spotlights a variety of different railways, including trams and subway cars alongside traditional steam railways, glistening high speed services and hefty bi-level American trains.

Often Robin and Taliesin find themselves waiting for hours for that perfect shot, sometimes in freezing, wet conditions. Usually they'll go to a location and get a feel for what's there first, and try and get as many frames as possible.

In the UK, a BR (WR) Modified Hall No. 7903 train dubbed "Foremarke Hall" passes through the Green Tunnel on the Gloucestershire Warwickshire Steam Railway in England.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

"You never know in advance what the shot will be like, so many things can go wrong, but that is what it is all about, the anticipation -- maybe this time, maybe, maybe, click?" says Robin

There's always an element of spontaneity in their shots, the photographer adds, even when they look perfectly composed.

"We are not 'technical' photographers, who worry about white balance, exposure settings etc, our view is that while you are fiddling with the camera you are not focused on capturing an unfolding scene."

The father-son team enjoys photographing steam most of all. Pictured here: BR Britannia No. 70013 "Oliver Cromwell" train shot at Sydney Gardens in Bath, England.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

They're also not afraid to include people in their shots, whether they're shadowy figures waiting on a platform as a train pulls into a station, or tired commuters crammed into subway cars.

"People are always at the heart of railways, we want to capture not just cold steel but the stories that are played out, the people who travel and work on the railway," says Robin.

"Mix and variety"

A tram and a bike riding through the streets of Amsterdam in the Netherlands.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

There are still "hundreds, maybe thousands" of railways across the world that the Coombes hope to capture.

"The US 'Big Boy' is high on the bucket list," says Robin, referring to the Union Pacific Big Boy steam locomotive.

Built back in the 1940s, only eight remain and most are on display in museums, but recently Union Pacific restored one and it's now operational.

A London Midland and Scottish Railway steam train spotted through the fog at Aisgill, Cumbria in the Lake District in England.

Courtesy Robin Coombes and Taliesin Coombes/Amberley Books

The duo also hope to capture a French main line steam train in future projects.

"The joy is always in the mix and variety," says Robin.

Although, he adds, nothing beats the sight of steam billowing into the darkness.

"Steam at night, the sound of it working hard on a clear frosty night, the warm glow from the firebox reflecting on the white billowing steam," says Robin. "Anything that makes the hairs stand up on the back of your neck."

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Trains at night: Amazing pictures of railways across the world - CNN