[Weter]

It's not a surprise, that websites may cease to exist one day.
Speaking about resources, where MSTS content was available for free download, that's pity, because activities demand specific rolling stock, but it usually not included.
One of MSTS enthusiasts have dedicated a portion of disk space for rolling stock models of ex-USSR, and developed the shell for searching and downloading that.
Last week, I was asked about where some models can be obtained, so I've decided then: this address could be useful for many ET members.
Here is description and rules for that.
There is activity database as well.
BTW, another purpose of that rolling-stock base is picking the authentic RS for composing activities, representing concrete railroad's operations.