We often hear about every spit and cough that went into a new piece of infrastructure opening.

But what about the ones that don't? Well, there's often a story behind them too.

There are so many train stations in London, yet only room on the Monopoly board for four of them!

For more news and features about London directly to your inbox sign up to our newsletter here.

From huge stations like London Paddington to smaller national rail stations such Bromley South, there are so many across the city which people use every day.

Yet have you ever wondered about the train stations that were planned but never built?

We've picked out some of the big ones.

The second King's Cross station

At one time, the Channel Tunnel terminus was to be next door to where it is now.

While today it sits at St Pancras, at one time it was going to be at King's Cross.

Yet instead of using the station that was already there, an entirely new station was going to be constructed beneath it.

Today's St Pancras may have never existed!

Yet this project would have involved the demolition of 83 homes and 58 shops, including the Scala building and people in the local community fought hard against this happening.

And while many MPs in Parliament supported it happening, the government confirmed in January 1994 they would instead go for St Pancras.

The Southwark Railway Terminus

At one point there was a scheme to replace five railway stations in Central London with just one huge terminus close to where Southwark Underground station sits today.

The scheme would have seen the stations at Charing Cross, Blackfriars, Cannon Street, Holborn and St Paul's gone in place of this one big one at Southwark.

It was never technically named but it probably would have been called Southwark if it had ever happened.

At the time there was a push to reduce road congestion in London through various techniques, including the conversion of the railway between Charing Cross and Cannon Street to a high level road.

There was demand for the demolition of these smaller stations to make more room for cars, which would have created the need for one single station, Southwark.

However, the plan never came to fruition and that's probably a good thing as it sounds like there would have been even more cars in London.

The Thames Viaduct Railway

This was going to be an astronomical project, born out of the need for more space in the capital.

Plans were launched for a major railway to run along the Thames, linking London Bridge to Westminster with a number of stops en-route.

It was hoped that the line would replace the 20 to 40-minute boat trip with a 10-minute train journey.

The project was set into motion and in 1853 was gearing to go ahead.

Except that never happened.

The firm just never had enough money or financial or political backing to make it happen.

Join the Mind The Gap group

We've created a Facebook group for people who travel on London's bus, rail, Underground, Overground and DLR services.

We will keep you informed about the latest news that affects your daily commute to work, as well as at the weekend.

We'll also let you know in advance if there are any roadworks, railworks or closures you should know about, or if there are any problems on the city's tube network.

Join the group here.

A massive railway terminus at Farringdon

A huge terminus was once planned for the land between Holborn and Faringdon.

While that never went ahead, the failure to make it happen actually indirectly led to the creation of the London Underground.

How you may ask?

During the early 1800s, Charles Pearson gained support for a massive idea - an underground railway.

But that was to be for later, and the underground part would be like an add on to the main event - a huge terminus at Farringdon.

The plan was to cost around £1m, at the time a colossal amount of money. Yet it never happened.

And a good thing too, as Pearson's attentions may have fully focused on that meaning we never got our beloved Tube.