Railway doesn't yet have autoscaling, only manually via the replica count in the service settings.

@brody last time I tried, it wasn't possible to choose the amount of resources allocated per service, which can lead to crazy costs.

For comparison, there's a "dyno size" on Heroku. On railway there is no way to control that.

https://railway.canny.io/feature-requests/p/ability-to-limit-pluginservice-resource-usage

oh you're talking about vertical scaling (that's just a buzz word).

adding the ability to limit the services resources has been talked about, but keep in mind that if you set a 1gb memory limit your app would just simply crash once it reaches that limit, and that's undesirable for the majority of use-cases and would have a lot of people wondering why there app keeps crashing, we see that question a lot for users on the trial plan.
so it's not as simple as giving users a slider since that (for the reason above) will cause an unnecessary amount of support load.
instead, set a billing limit on your account.