/etc/emacs/site-start.d/50scsh.el is in scsh-common-0.6 0.6.7-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | (autoload 'run-scsh "cmuscheme48"
"Code for running inferiour `scheme48' or `scsh' in Emacs." t)
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