Talk:PF II Train Set/@comment-188.231.179.135-20150416202620/@comment-15636815-20150416223904

There are four sets like this.
 * PF I (steam)
 * PF II (electric)
 * PF III (diesel)
 * PF IV (maglev)

There are four sets because the game has 16 materials, and no train may carry more than four types. All four of these sets haul cargo, yet only one of these sets uses a locomotive that gives bonuses to cargo wagons.

The bottom line: There are many reasons why a particular set may use a particular type of locomotive. It is unwise to assume that the locomotive for a set must be the type that maximizes bonuses to its wagons.