This route is getting old now and does have it's faults. In some places, the tracks are placed too close together so passing another train will result in a crash! However, this doesn't happen with the supplied ex London Underground trains, only seeming to effect full size main line stock, so if you do write any scenarios for it, be careful!
Now for the good points, for a start you get 14 scenarios, yes, FOURTEEN! It seems recently it's become the norm for DTG to only give a few, relying on people like you and me to write more for them but this route come already packed with tons to do. As well as this you get three types of train, Diesel, Electric and Steam with a nice varity of rolling stock. The class 483 ex 'tube' trains are unusual and a change from the norm, not wonderfully detailed but you do get two liveries. The Invincible 0-4-0 steam loco is very cute and comes with a couple of period carriages as well as some varied goods stock and you even get a diesel personnel carrier for a bit of fun as well.
The line itself is tiny, 8 miles end to end and i'm sure many will think thats just not worth bothering with after theyve done a run from London to Brighton for example. However, the low speed limits to make for a challenging drive that can last for a surprisingly long time. I recently wrote a scenario for this and just one trip along the line was over half an hour, plenty of time for most players. It's also surprisingly difficult to keep a clean sheet with those speeds as well. Those of us used to rushing to tight commuter timetables will be surprised how hard it is to go SLOWLY!
At the full price this is still pushing it's luck at about £20 but there are many sales and it's part of a couple of packages. If you can get it with a discount, SNAP IT UP!