One man operations is now a common TBL operation. It is safe and efficient. Pushbacks can be carried out at slightly higher speeds than walking pace without extra manpower.
There are only a couple of Airlines that still do not accept 1 man operations (mainly due to internal issues with unions etc), most European Airlines are happy with our companies procedures in this respect
We have had an issue with the internal cabling of our French made TBL PB tractors which cause breakdowns in communication and therefore Ground/Air Radio is although slightly expensive to start off with (rental of frequency and licences, but the radios are required for A/C towing Operations already)they are a reliable and versatile way of communicating with FD Crews.
The PB Operator (Also Dispatcher of flight) will inform the FD crew of the frequency that the pushback will be undertaken with. The TBL tractor will also have the frequency displayed on the roof, next to the fleet number.