Makes three simple changes:

• Trains move at 8x speed [Note that this doesn't mean 8x throughput -- trains still need to accelerate, decelerate, and wait for each other at signals.]
• Capacity is reduced to 40% of normal in cargo wagons and fluid wagons (a bullet train is lighter than a freight train.)
• Fuel efficiency of the locomotives is 4x normal (to account for the 8x speed)

The idea behind this mod is that rail systems are usually overkill: they provide a ton of throughput but introduce high latency. Then you mitigate the latency with massive chest buffering at each stop. In vanilla play, a single unidirectional rail loop with just a few trains is usually more than sufficient for the midgame. By the time you need complex rail networks (if at all), you're nearing the end phases of the vanilla game anyway.

Faster & lighter trains means that you build rail networks that use "more fast trains" rather than "a few slow trains". It's a great mod to use on Rail World settings, and it's generally satisfying to watch your trains waiting and taking turns with each other at high speeds.

It also provides a great way to debug complex train networks. If you have any pathing or collision problems, you run into these problems sooner rather than later.

This mod is memoryless meaning that its effects on trains and your maps will only last as long as the mod is enabled.