Looks like they're using CryptoJS[0] based on some symbol names in the source[1].
[0]: https://github.com/bianjiang/crypto-js-npm/blob/1762940b9eef... [1]: https://maps.amtrak.com/rttl/js/AS.js
[0]: https://github.com/bianjiang/crypto-js-npm/blob/1762940b9eef... [1]: https://maps.amtrak.com/rttl/js/AS.js
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