Michael has HO scale and writes:

“I read abutments at the end of bridges serve to support the structure and foundations from the horizontal and vertical loads that get placed on them. I will need to determine the necessary heights and widths needed to support the bridge and track elevation, with my main concern being how to maintain level track over joins leading to and over the bridge. I am very much in the early planning stages so want to get my head around the process before I start out. Any help would be good. THX”

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