baseplate
/B EY1 S P L EY0 T/noun
- 1
A solid piece of material that has enough strength and sturdiness to serve as the surface to which other things are attached to be supported.
noun
- 1
A steel plate used on rail tracks between flanged T rail and the crossties.
Synonyms
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Source: https://en.wiktionary.org/wiki/baseplate, https://en.wiktionary.org/wiki/tie%20plate