By the mid 21st century, a transmat network named Travel Mat (T-Mat for short) had been established, with T-Mat cubicles used as a reliable and cost-effective means of mass-transporting goods all over [[Earth]; it seems likely that Travel Mat was the name of the corporation or syndicate that established and ran the network.
The development of T-Mat ultimately led to the abandonment of manned space programmes, with the only launch vehicles remaining being those required to place satellites in terrestial orbit. It seemed never to occur to anyone in charge that the transmat link between Earth and the moon might one day catastrophically fail beyond the capacity of the moonbase personnel to repair. The Ice Warriors managed to exploit this weakness when they took over the base as a beach-head for their ill-fated invasion of Earth; a corollary of this compromise of the network was a disasterous collapse of global food distribution.(DW: The Seeds of Death)
In the aftermath of the invasion and the Thousand Day War, the T-Mat network was replaced by the Interstitial Mass Transit System.