R49 performance

[DrJimi]

Does anyone have first-hand or anecdotal knowlege about the performance of the R49? Comparisons to other period stock (e.g. COCP, 59TS) would be ideal. We're now glueing together our MSTS R49 and I'm at the point of tweaking the physics. From "Steam to Silver" I see that all cars are motored, but each with only 1 motored axle. I have dimesions and car weights correct (and also weight/drag, etc. factors). I'm trying to fine tune acceleration and braking in particular.

Some clues that would really help are things like:
Speed (from stand) at the 6-car mark (help me figure acceleration)
Time or distance to 30 or 40 mph
Distance from 30mph to stop (within its own length?)

Any and all info, estimates and educated guesses welcome!

May thanks, Jimi

[100andthirty]

Tubeprune has probably driven them and can no doubt provide first hand experience!!

As far as I recall, the electrics were set and they were geared to have a high (for the time) initial acceleration and low top speed. If you have already got COP stock, I would give it a slightly higher acceleration and slightly lower top speed. Top speed will only matter on the east end of the District and the Wimbledon/Richamond branches.

I recall that drivers would hack round the curve into Victoria EB much more quickly than they do today! Probably something to do with the absense of an efective speedometer (on the old train, that is!)

[100andthirty]

And braking would have been marginally better than COP stock.

[Deleted]

watch the j&k video called all change at earls court you see trains flying in

[Ben]

On the R49's (and all the others) 50% of the axels were motored, so thats one axel per bogie instead of per car.

I can give you some figures for the steel R stock if it helps atall?

[100andthirty]

Steel and Aluminium trains would have been set to perform the same as they could couple to each other. Any differences would have been inconsequential

[DrJimi]

After some tweak and test I think we're close. I based the physics on our 59TS but increased the acceleration below 20mph. Thanks to Dstock7080 (History thread) we also discovered the color of the 'liquid speedo'. Normally I'd post screenshots to the sims threads, but I hope it's relevant here. (BTW - ignore the digital readouts - they're purley for monitoring performance while testing).

APPROACHING HLJ EB


ARRIVED AT EALING COMMON


I suspect our speedo may be a tad more accurate than the original ;D Is the liquid color about right?

Thanks, Jimi

[Dstock7080]

Jimi, excellent cab views!

Perhaps the 'speedo' could be a darker green. Yes, it probably will be more accurate than the real ones!


With regard to performance; yes, the R Stock were 'all-motored' but this didn't seem to make them much difference to the 'COPs' that were running. The higher acceleration was noticeable. The overall top speed was slower than when the unrestricted 'Ds' were first introduced. The lack of an (accurate or not!) speedo did make the runs 'seem' faster.

[DrJimi]

Thank you sir! I'll tone-down the liquid a bit

EDIT: Pics of the trains in the sim thread here (scroll to end):
districtdave.proboards39.com/index.cgi?action=display&board=Rail&thread=1184235706&page=1

[tubeprune]

100andthirty said:

Tubeprune has probably driven them and can no doubt provide first hand experience!!

As far as I recall, the electrics were set and they were geared to have a high (for the time) initial acceleration and low top speed. If you have already got COP stock, I would give it a slightly higher acceleration and slightly lower top speed. Top speed will only matter on the east end of the District and the Wimbledon/Richamond branches.

Sorry I didn't see this before. I am in Canada on business. Back later this week. When I get home, I'll look up my old R Stock book to see if I put anything in it about performance from official records.

It is correct - good acceleration, low top speed of 45 max. They were faster than 59TS accelerating out of Hammersmith WB but always got beaten to the top of the bank.

The brakes were not as good as CO/CPs. I really don't know why but the blow-downs came in early. Of course, you generally came into the station at a lower speed on R Stock.

[DrJimi]

Thanks TP! We're close then - I get about 25mph at the 5-car board, and once had it up to almost 50mph, on a downgrade with a following wind ;D

I'll post new pics once we've 'fixed' the dest blind. Headcode lights are done for several destinations. Looks cool seeing one (AI train) approaching and realising where its going (in theory).

[engineersareus]

If you want to get CO/CP & R stock correct don't forget to add the feature that when they were crush loaded the doors would fail due to the change in the shape of the car structure !

Then of course all the passengers would be 'tipped out', the 'defective' train would stop at the next station where the doors would open & close OK and it would re-enter service.

The station where the train was 'tipped out' would now be very crowded and all the people would try to get on the next train that would already be heavily loaded. As a result the doors were very likely to fail again - there is a story this once happened to 6 successive trains - not sure what the state of the platform was after that !

[Oracle]

Oh no, not ther poor Guard having to open, close and re-open again! Brings back memories indeed! Also 1938 Stock that would have one door that decided to be like Lance-Corporal Jones and steadfastly refuse to close in time with all the others, i.e. one step behind!