Locomotion is one that's hard to get used to, but is great for a rainy day.
The reason why this game is under appreciated is because it takes time to get used to. It's not like you can play this game, right off the bat, and be a master. Luckily for some, there are tutorials for people who seem to not understand the basics. Locomotion is basically like Roller Coaster Tycoon meets a sequel of Transport Tycoon. If you have played those games, then I'm sure I addressed earlier you'd know what to do.
The objective of this game is to either reach a certain goal of cargo transported, or get your company value up to a certain percentage. Your opportunities are endless. Ships, planes, trains, buses, trucks and trams are vehicles you can use to reach your goal. There are tons to use; more are made over time. The only flaw if you were used to the Transport Tycoon series, is the absence of purchasing land from other companies, as well as the monorail/mag-lev trains that used to be available later in that game. Nevertheless, they have been replaced by most features you get from Roller Coaster Tycoon, so don't be disappointed.
Overall, I would strongly suggest you overview this game thoroughly, even play a demo of the game, which can be available on Atari's website, before you purchase this game. Though Chris Sawyer's Locomotion may be a bit harsh to some, I'm sure over time, you will learn to appreciate this game for what it is.