When you say everyone has different dimensions do you mean the units in the files are different? Then you can use a seed file which has a similar Units Settings.
What i meant was:
That i have severall indiviually modelated blocks which i'd like to "connect" or "align"
with a "alignment" or in other words a "track" modelated in Open Rail designer.
I can suggest using AECOsim's companion feature Generative Components for this.
Following is a link form the Generative Components Forum thread which aims to achieve something similar and should be helpful: