What does RRI stand for?

RRI stands for "Route Relay Interlocking"

How to abbreviate "Route Relay Interlocking"?

"Route Relay Interlocking" can be abbreviated as RRI

What is the meaning of RRI abbreviation?

The meaning of RRI abbreviation is "Route Relay Interlocking"

What does RRI mean?

RRI as abbreviation means "Route Relay Interlocking"