In late 1987 the first SIG Type BT41 bogie had been trialled under a Mk3 coach M12140 in a special test train which on 1st November achieved speeds of nearly 150 mile/h on the ECML between York and Darlington during the test running.

Does anyone happen to know the exact type of SIG bogie which is used on an EW IV coach and whether it shares any significant similarities to the British Rail Mk4 SIG bogie?

The FIAT-SIG bogie is a welded H frame type based on the Eurofima standard. The primary suspension is with articulated arms and coil springs, secondary suspension of integral flexicoil type with coil springs and rubber pads on top and bottom, anti-roll bar, vertical and transverse shock absorbers and anti-hunting dampers.

Bogie is the part on which the coach rests and due to which the coach runs on the rail line. That’s why it is manufacture under strict precision so that the dimensions do not vary too much from drawing. It is an independent unit used under a long vehicle, usually mounted on two pairs of wheels (except some special purpose stocks).

2015年7月24日 · The bogie frame is a solid welded frame made by steel sheets and forged or cast parts. The frame is made up of two longitudinal components (1) connected by two cross-beams (2) which also support the brake units. The various supports which connect the different bogie components are welded to the frame.

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It is fitted with experimental BT7 bogies with Clouth rubber primary suspension. It was also used to trial the SIG bogie prior to selection for the Mk4 coaches. Not yet come across any photos of T4 fitted to M12140. BT17 bogie was a BT10 but with coil/rubber pedestal primaries and was fitted under Mk3 coach No: M12093.

2002年12月14日 · AFAIK, at least the earlier SIG bogie is provided with a cylindrical guide type primary suspension design (CGTPSD). Since there may be a trend in the world to use the radial type truck design (RTTD) recently, does SBB also follow abovementioned trend, i.e. leaving the CGTPSD and applying the RTTD in the near future? WFYRAYEC. Thank you. Greetings.