| Connection | When two services are timetabled such that people can get off one and onto the other with minimal delay - eg "five minute connection" means one is timetabled to depart five minutes after the other arrives |
| Coordination | When the timetables of two services are set relative to each other to make the overall service better - examples of this include connecting services, or parallel services which work together to provide (say) 15 minute frequency by using two partially parallel routes at 30 minute frequency |
| Frequency | How often a service runs - eg "15 minute frequency" means there is a service every 15 minutes |
| Heavy rail | Track for a full size train, due to the fact that the rails trains run on are much thicker than tram rails. The advantage is that larger and heavier vehicles can run on the rails, and usually at higher speeds. |
| Integrated ticketing | A system where you can buy a ticket which covers more than one actual trip, eg a train trip and the connecting bus trip |
| Light rail | Track for a tram. Lighter rails can carry less weight and usually have a lower speed limit, but are cheaper to construct. |
| Overhead | The electric wires on top of train or tram track, which carry current to drive the vehicle |
| Punctuality | What percentage of timetabled services ran on time (within set limits) - eg "99% punctuality +1/-5 minutes" means only 1 service in 100 ran more than one minute early or five minutes late |
| Reliability | What percentage of timetabled services actually run - eg "99% reliability" means only one in 100 services were cancelled |