Yep, mine was the same. The pack has three locomotives, not two.
Although I'm not really into US prototype, and had never even heard of this train, let alone be familiar with it's prototype, I admit
The Blue Comet really caught my eye. With one of Auran's voucher offers I got $5 off the price too, which was even better, which as I result I succumbed to the temptation and purchased it last week.
And, having bought the DLC, I must say I am very impressed - the locos are absolute beauties on the track, and the carriages are really well made too with their fully furnished interiors. Even the loco crew is animated!
Installation is pretty easy - the only minor hiccup I had is Auran's server takes time to process your purchase and as such will throw up an error if you try downloading it too soon after completing your purchase. Don't worry, it's normal - just wait about 15 minutes or so and then try the download link again (I waited half an hour just to be safe).
Also it should be obvious that Trainz will do a Quick Database Repair the next time you load Trainz after installing the DLC, but it shouldn't take too long to do.
