| Home |
| Search |
| Today's Posts |
 |
|
Menu
| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
| Reply |
|
|
LinkBack | Thread Tools | Display Modes |
|
|
| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
| Reply |
|
|
LinkBack | Thread Tools | Display Modes |
|
|
|
#1
July 9th 11, 07:30 PM
posted to uk.transport.london
|
|||
|
|||
First Great Western Equipment Question
"Paul Scott" wrote:
None of FGW's 2 car DMUs are diesel electric - I'm sure the only diesel electric units (ie DEMUs) in use in GB are the Voyagers and Meridians. The latest new small DMUs (the 172s used by LO and Chiltern) aren't diesel electric either, and have surprisingly gone back to mechanical gearboxes following the widespread use of hydraulic gearboxes... Why surprisingly? The six-speed mechanical gearboxes have much lower power losses than a two-speed hydraulic transmission using a torque converter. This leads to significantly improved fuel consumption and lower CO2 emissions. |
|
#2
July 9th 11, 08:33 PM
posted to uk.transport.london
|
|||
|
|||
|
First Great Western Equipment Question
"Bruce" wrote in message
... "Paul Scott" wrote: None of FGW's 2 car DMUs are diesel electric - I'm sure the only diesel electric units (ie DEMUs) in use in GB are the Voyagers and Meridians. The latest new small DMUs (the 172s used by LO and Chiltern) aren't diesel electric either, and have surprisingly gone back to mechanical gearboxes following the widespread use of hydraulic gearboxes... Why surprisingly? The six-speed mechanical gearboxes have much lower power losses than a two-speed hydraulic transmission using a torque converter. This leads to significantly improved fuel consumption and lower CO2 emissions. I'm not surprised myself - but there seem to be many critics who keep suggesting it'll never work, usually based on what happened about 40 years go... Paul S |
|
#3
July 9th 11, 10:43 PM
posted to uk.transport.london
|
|||
|
|||
|
First Great Western Equipment Question
"Paul Scott" wrote:
"Bruce" wrote in message .. . "Paul Scott" wrote: None of FGW's 2 car DMUs are diesel electric - I'm sure the only diesel electric units (ie DEMUs) in use in GB are the Voyagers and Meridians. The latest new small DMUs (the 172s used by LO and Chiltern) aren't diesel electric either, and have surprisingly gone back to mechanical gearboxes following the widespread use of hydraulic gearboxes... Why surprisingly? The six-speed mechanical gearboxes have much lower power losses than a two-speed hydraulic transmission using a torque converter. This leads to significantly improved fuel consumption and lower CO2 emissions. I'm not surprised myself - but there seem to be many critics who keep suggesting it'll never work, usually based on what happened about 40 years go... .... while their sucking their teeth, sighing and shaking their heads theatrically as though they know something that they don't. The motor industry has steadily been abandoning its torque converter gearboxes over the past decade in the quest for better fuel economy and lower CO2 emissions. The railway industry needs to catch up. |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
![Bruce[_2_] is offline](https://www.londonbanter.co.uk/images/SultanThemeVB3R/statusicon/user_offline.gif)
Hybrid Mode
