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At Level 20, you get your last Barge and the Train.

The train has 3 cars (rows), each asking for the same products in 2-4 crates (6 to 12 crates total). The train pays 65% of a products value per crate and gives no materials. If you complete 1 car (row), you will get a coin bonus. If you complete the full train (3 rows), the final bonus will also give you a random selection of materials. A full train will give you 1.95x the coins per product (compared to the market) and 60% of the materials. My basic rule of thumb is fill the whole thing, or send it empty.

The cool thing about the train is you can send it away empty or partly filled, and even an empty train counts for the 'Send 1 Train' daily quest.