![]() All numbers are just indicative of relative potential, not precise. Looked at this way, the Table below shows how a number of different locomotives might be expected to perform with a 1065 ton train on a level track, again working at 70% maximum TE up to 20mph, maximum steam rate about 600lbs/sqft/hr beyond that. due to cinder cutting, by not asking too much of them- the draughting usually allowed up to at least 900lbs/sqft/hr- a whopping 120000lbs/hr for the S1. Above this specific evaporation rate, unburned coal losses rise sharply, and it may be that this was a prudent level to avoid high boiler maintenance costs, e.g. (This figure refers to top quality Coal of about 13500BtU/lb it would be less for lower calorific values). As far as I can tell, it was unusual for US boilers to be steamed much above about 600lbs steam/sqft/ grate/hr, sometimes less. Starting is about TE, sustained performance is about how hard you are prepared to steam the boiler. However, my sense of the way locomotives were actually expected to perform is somewhat different. This kind of time is what you might claim for PR purposes. During the acceleration, steam rate is in excess of 100000lbs/hr, and you are burning about 17000lb/hr top quality coal. After that, you can maintain 100mph with about 5400HP. The first is, if we assume that flat out working is 7200HP (I don’t know how this reported figure was arrived at), and that when starting you can put down about 70% of the rated TE without slipping (Pure guess, about the maximum normally applied ion the UK), then you reach 100mph in 11 miles, about 9¾ minutes. I have two answers to your question about how long it would take 6100 to accelerate 1065 tons to 100mph on level track. "An assessment of the benefits of the application of Franklin valves on theįorum member Dreyfusshudson (He has very rich experience in railroading, including developing and using computer software to simulate different steam trains performance, but he said he prefer to stay anonymous in the forum) showed us a table in one of his post:Īs tim z points out below, it’s not quite as you think- the resistance of the locomotive would not change, only the coach resistance would fall in proportion to the weight, and the figures themselves are not directly useful. ![]() Once the engine started accelerating, she will run like a wild horse (with 1360 tons behind her!!) Was starting a steam locomotive at very short cutoff a normal thing in the past? Thanks a lot! I don't know if this is realistic or a bug or glitch of it but I can't even start the train on level track at 30% cutoff due to wheel slipping. Within 12 mins, it will reach 100mph+ with 1360 tons behind her, depends on the gradient of the track (I am not using a level track). ![]() Using updated data, PRR S1 will only start moving if the cutoff was set at 20% or less plus full throttle. In the forthcoming video, I will try to demonstrate S1's wheel slip problem if the engineer starting up the train at maximum cutoff (70.6? %), apply full throttle. But I can make a car with your avatar on it within 5 mins. In the game, I didn't edit the engine config file of the Niagara, but their overall performance is as durable as N&W Class J but I might give it a try to see if the data in the config file of Niagara in the game can be further improved for better realism! There is no undercar Spicer generator in this game and details like valve travel in the cylinder: the lap, the lead, the exhaust clearance, valve diameter seems to be not applicable to improve the realisticity. These train simulators available on the market "probably" can't simulate the differences of performance between an engine using poppet valve gear or conventional gear, a user can only adjust the parameter manually base on estimation or assumption. RailDriver is an interesting device and good for the elderly since a user doesn't need to adjust the throttle with a little mouse and arrow! But you are right that some modification will have to be done for steam locomotive's simulation. I also hope that there was an official testing report focus on the differences of performance between PRR S1 and NYCentral S1b! ![]()
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