raff - reco
- raff
- raft
- raft bridge
- rafter
- rag
- rag bolt
- rag head
- rag pump
- ragged
- ragging
- raid
- rail
- rail / railway track
- rail base
- rail bond
- rail bonding
- rail chair
- rail shoe
- rail spike
- rail web
- railroad / railway line
- railroad earthwork
- railroad track
- railway
- railway bridge
- railway carriage
- railway crossing
- railway crossing barrier / gate; railway gate
- railway engine
- railway ferry
- railway fill
- railway guide
- railway switchgear
- railway-station
- rain
- rain and snow
- rain cap
- rain cloud
- rain gutter / pipe
- rain shadow
