When the A1 was introduced into service, 0-4-0s were being used by other railroads.

This was an important consideration at the time, when many new designs were being introduced into service.

Digital fire control computers were not introduced into service until the mid-1970s.

The aircraft was originally introduced into service on April 1, 1994.

It first flew on 14 August 1974 and was introduced into service in 1979-1980.

By 1945 then new Yak-3 fighters were introduced into service.

These were numbered 4011 - 4097 and started being introduced into service in 1983.

It was introduced into service at the same time as the Type 38.

By 1945 new Yak-3 fighters had been introduced into service.

The Short 360 seats up to 36-39 passengers and was introduced into service in 1981.