I’m hosting on Railway and would love a Modal-style Sandbox primitive: programmatically spawn short-lived, isolated containers to run arbitrary commands, stream stdout/stderr, then auto-destroy. Modal’s model (create sandbox, execcommands, control timeouts, optional image/volumes) is exactly what I want on Railway.

With an SDK + API: e.g. railway.sandbox.create(...), sandbox.exec(...), sandbox.logs(), sandbox.stop() (plus CLI equivalents).

Also related: Vercel sandboxes and Cloudflare sandboxes