I've been enjoying my time in World of Subways 3. It's definitely a true simulator in every sense of the word. You are responsible for running a subway train in London's Underground on the Circle Line. You will need to set up your train before setting off, including going to the rear of the train to turn on your tail lights, then walking to the front of the train to start the train, turn on any additional lighting (headlights, cab light, passenger compartment lights) as well as turning on the heat for the passenger compartment. You will then need to change the train's sign to indicate the route you're running, and set up the automated voice messages to correspond to the route you're running, so that station arrivals are properly announced. You can also manually trigger announcements through the same control panel used for the automated messaging system.
This is not a 'lite' simulator, you are responsible for performing your duties as if you were actually driving the subway train. Failure to follow speed limits will cause you to fail (at least in missions), and you want to maintain the schedule to the best of your ability. There are also signal lights that you will need to follow in order to be successful.
The missions aren't so much missions as they are tutorials. They work well in this regard, however it would have been nice if they included a mission editor and workshop support so that more varied missions could be created by the community. The missions can be fun, though a bit challenging at first as you're learning the ropes of driving the train, and while you're learning the route, you can find yourself accidentally speeding, which can cause you to fail the mission requiring you to restart the mission from the beginning (if you wish to complete the mission at all, as the missions are optional.) Once you're done with the mission (if you choose to do them), you're then free to select a route and drive it, just as if you were scheduled to drive that route for your shift that day. While saving your progress is not possible during missions, you can save your progress when just driving a route. This affords you the ability to stop at a station, save the game, and return later to finish your 'shift'.
Graphically, the game looks fantastic as there's lots of detail in and out of the tunnels, that give you the feel of really being on a subway line. Things like new pieces of rail sitting along the side of the tracks, that are waiting to be put in place are common, as are things like shipping pallettes. Each station seems unique and it seems quite a bit of attention to detail has been put into each station, so that the more you drive, the more easily you start to recognize a station as you pull in. I've never been to London, so I can't say whether the stations are accurate to their real-world counterparts, but I can say that each station definitely maintains a uniqueness, so you never feel like each station is just a cookie cutter copy and paste job of any other station. The models for the driver (your character) and the passengers could use some polish however.
In the audio department, they've done a decent job using believable sound effects that you would expect to hear while riding on a subway train. I'd say they're a notch above utilitarian, but they're not bad by any stretch of the imagination. Simply, they do the job of conveying the sounds you would expect to hear in a believable manner.
As for the controls, they work well, though I'm now using a Rail Driver unit with it instead of just the mouse and keyboard, which has helped me in terms of overall immersion. Despite using the Rail Driver controller, I still need to use the SHIFT + Mouse combination to interact with some things like the automated station announcement system. The Rail Driver unit is natively supported, but the levers and switches used do not line up with the default control stickers, so it takes a bit of getting used to. For example, the Auto Brake lever is actually the throttle control, while the Independant Brake lever is the gear selector. It feels a tad awkward at first since those aren't the way the controls are set up for other train simulators, but once you get used to it, it really does become second nature.
Overall, I would definitely recommend this to anyone who enjoys passenger-orientated train operations simulations. The challenge is getting to each station on time without speeding or running any red lights. I'm running it quite well on my laptop (an HP DV6-6135dx) which has an AMD A-8 3500 APU, though I did have to turn a few graphics options down to smooth it out. I still get an occasional stutter here and there, but with the slightly lower graphical settings I'm using, it remains mostly a smooth experience.
I would not recommend this for someone that just wants to drive a train as if they were driving a HO-Scale or N-Scale model railroad, as it's a bit more complex than that, but if you enjoy passenger operations in other simulators, and don't mind a bit of a learning curve in order to properly drive the train, then there's quite a bit of enjoyment to be had here.