Question:
Rule 20G1a Strat Bombing Rail Marshalling Yards says “Only a limited number of hits are allowed per yard in a player turn: 1 per dot city and 2 per major-city hex.” That seems to leave out the marshalling yards in ports (regardless of city size) ” mentioned in rule 7A. Am I missing something, or are these port marshalling yards illegal targets? If not, what limit of hits on them, and is that limit cumulative with the one on dot/major city hexes?

Answer:
The one hit per dot city limit should be one hit per marshalling yard in a non-major city. In other words, you can get two hits per major city hex and one hit per other city hex (note that all ports are also cities of some size).

Source:
TEM 59/60