It's an alien-designed Locomotive made to work on Earth's rail system by the Combine Empire, and is from Half Life 2.
http://half-life.wikia.com/wiki/Razor_Train
http://half-life.wikia.com/wiki/File:Ha ... 6Canal.jpg
Here's a picture of several of them.
Ingame it has a speed of 131mph (Originally set it to 210, but I guess there's a speed cap on Diesel Locomotives or something), 10,000 Horsepower, and an enormous pricetag. It's released in 2040, along with a specialized carriage that shares its rather tall size that can be retrofitted to any cargo. Really, it's kind of overpowered, and more of a "for fun" vehicle than anything else.
Planned updates:
- A second "pod" based carriage, to split the cargo between liquid/livestock based goods and "solid" goods in the original carriage.
- Slightly less overpowered stats, possibly an earlier release date.
- Double-header version to replace the rear-facing train.
Desired, "maybe after this is done" updates:
-The prototype version of the Razor Train, as seen here:
http://half-life.wikia.com/wiki/File:De ... _train.jpg
Desired but very unlikely updates:
- A set of Combine-themed Station and Depot tiles.
- An HQ Replacement that converts it into the Combine Citadel.
And here's the file.