It took about four hours to raise full steam in the original boiler.

Of the twelve original boilers, two smaller ones were mixed-fuel capable.

In order to be used on future services, considerable work was necessary on the 87 year old locomotive, which still has its original boiler.

All the new boilers were pressed to 160psi, an increase over the original boiler's 130psi.

For example, the original boiler was replaced in 1927.

It has retained its original boiler, but lost the front apron.

At this time the locomotive was still carrying its original 1864 boiler.

Many still have the original boilers, designed for coal and later converted to oil or natural gas.

However, the original boiler and engine room design were modified in 1966.

However, once the original boilers were worn out, it became more of an economic proposition to do so.