Not sure how helpful this will be, but the measurements I could get readily were so different cause the designs were so different. MTH heavyweight was 5mm thick, I installed a 3mm led there years ago. The Lionel streamlined cars have a 3mm “gow” lighting an endcap design, indirectly. Many weren’t lighted at all. So I’m pretty sure one has to approach the task on a case by case basis. But here are some photos if they help any.
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