Nick said:
You mean Ronnie knows that?
Nick said:
No, they dont, that's a stupid assumption to make.
Nick said:
thats why BR standardised the Mk1s to B4
Wrong, if they standardised them all to B4 bogies, how on earth did Commonwealth and B1 bogies survive into preservation? There were a number of design changes, the B1 was replaced by the Commonwealth because it had a tendancy to ride up over the flange at high speed (over 90mph), hence the reason why B1 bogies were limited to 90mph. They were replaced by the Commonwealth which is, in terms of maintenance, the best bogie that the Mk1's carried, due to being able to see everything from a trackside level, the ride quality given by a Commonwealth bogie is akin to that given by a B4 bogie, but is not as smooth riding as a B4 bogie. The B4 bogie was designed to provide a smoother ride at higher speeds, indeed the bogie was passed for 110mph running, however this was rarely used by British Rail on the Mk1 design of coaches.
Nick said:
what you havent said though is what bogie is superior to the Mk3 bogie decided by BR as you had earlier said you knew.
The B1 bogie was not tested. However the ride quality given by a B1 bogie at 60mph and above is relatively smooth and comparible to the ride given by a Mark 3 coach (I dont do Mark 3's).
The Commonwealth and B4 bogie types were both tested and the ride quality was considerably lower than that given by a Mark 3 coach below around 45mph, however once the coaches were running above 45mph the ride quality began to surpass the Mark 3 build, and at 100mph the ride given was vastly superior than a Mark 3 at a similar speed.
When you next ride on a Mark 3 (3, 3A or 3B, doesnt matter which), I advise you to stand near a vestible and watch how the train sways considerably at speed, and if you ever get the chance to do so on a Mark 1, or even Mark 2 design (B4 bogie was used on both types), do the same, and you'll notice considerably less swaying from the Mark 1/2 than the Mark 3.
Nick said:
Instead you have just talked about how coil sprung suspension is better than leaf sprung something everyone knows.
The first mention of helical spring and semi-elliptical (right spelling?) types was made by the person registered as 'Nick'.
So Nick, have you found the mythical right side hinged Mark 1 passenger door yet?