Hello Scot,
here are some answers from the other side of the great sea, and let's see some differences:
pennsyscot wrote:When a mainline engine came to the engine house at days end, wasen't the fire dumped?
Well, Scot, this is a question, what is next for the engine. If there was boiler maintenance needed, like a wash-out or maybe a tube had to be fixed, the fire was dumped.
But for normal service, the fire wasn't dumped, it was cleaned.
I thought the grates had to be cleaned and ashpan washed on a daily basis.
There you got the answer to your question. Dumping means to abandon or get rid of the fire. This is done only for maintenance duties or in case of emergency. But for common task, the fire was cleaned, as the ashpan/ashbox was cleaned. The engine rolls at the end of the day or at the end of service to the ash pit.
In Germany we had no shake grates, so all work had to be done manually.
First you open clean the area and open the grate pit to the ashbox below.
Now you use several pokers to loosen hard clinkers of slag, some slag deposits are loose, so get crushed and maybe the get their own way through the grate bar chasms into the ash box. All larger lumps were pulled with pokers to the grate pit and dumped into the ash box. The grate bars were carefully scrated free from deposits with the pokers and the remaining fire was pulled and pushed to the firebox walls. Now the grate pit was closed and the ashpit pipes were opened to extinct the ashbox deposits. Now the ashbox bottom doors were opened and the ash was dumped into a ashpit...
Some houses had water filled ashpits, so here the ashbox doors were opened first, before fire cleaning, in most other cases below the ashbox bottom doors a small tippers was placed, were the ash had to be dumped in.
Now the fireman had to be go below into the ashpit and use again some pokers to clean the ashbox, on ashpits filled with water the firemen used the ashbox tubes to float all ashes from the ashbox into the ashpit.
After closing the bottom doors of the ash pit, the fire was given some fresh fuel, but only to ensure the hold pressure, but not to build up more. Also the boiler was feed up to maximum water levels.
The engine no was moving into the shed, were the chimney was placed under the smoke exhaust. Now all dampers and air flaps were closed, the handbrake was tightened... end of service was close.
- Don't forget: In Germany no self-cleaning smoke boxes exist, so here the ashes and fines had also to be removed manually before or after grate cleaning.
If this is the case, how was the fire restarted?
Well, if once, by a failure of the night watch or sheds fireman the fire of a loco has gone out, or the fire was accidently dumped, or had to be dumped, because of bad coal.... the fire had to be restarted with papir, matched and wood, like any common oven fired with coal had to.
If you were lucky, and a loco in the track beneth at the shed was in Service, you could take some shovels of coal from there and relight the fire.
But if not, well, start with the wood fire and change to coal.
How long were the locos able to hold pressure?
Depending on insulation of the boiler and the temperatures, as well as with how much pressure the loco was left and which remaining fire was set, there were about 4 up to 12 hours. After this time, you can't do any self-restart attempts, and you have to consider it as a 'cold start'.
Modern boilers are able to have more than 18 hours, till their pressure is to low for self-restart actions.
Was there enough pressure remaining to use the blower after servicing?
Yes of course!
Because fire cleaning wasn't possible without blower!
I assume that the firebox had to be refilled manually. How much time is required to go from the pit to the ready track?
Well, if the engine was only several hours out of service, like over night, the sheds fireman kept a special fire alive, which holds the pressure up to a certain level, enough for the boiler feed pumps and maybe the air pumps to be alive.
So only about 1 hour was need with such an engine to return to service, or less, if you got a good sheds fireman, which have the schedule tables in their head and do the preparations well.
How frequently did passenger express locos recieve rod bearing lubrication, more than once a day?
In Germany we had seldom grease lubricated bearings. Commonly oil lubricated bearings were used, so each longer break in service was used, to replenish the oil stocks in the oil tidies at the rod joint points.
Usually you do the job more often, because to run low on lubrication might end the travel much earlier and that's no good for the staff.
Allways keep two-thrid level in gauge and a well set fire, that's how the engineer likes a fireman