Talk:Diesel multiple unit

message: Unless anyone has any objections I intend to merge this article with DEMU.
Dellarb 08:20, 29 March 2007 (UTC)
thread_title:  Merge 

message: I am attempting to seperate all the discussion of MU as in train control into the article Multiple-unit train control, leaving all discussion of MU the cars for this article, EMU, and Multiple unit.  As such, I moved the discussion of MU Train Control to that article and removed a few links that seemed out of place without it.  If people think this should be undone, I would prefer that it's discussed here or at Talk:Multiple-unit_train_control first.  Thanks.  Skabat169 05:11, 9 June 2007 (UTC)
thread_title: [[Multiple-unit train control]]

message: Direct-drive diesel locomotive would need an impractical number of gears to keep the engine within its powerband; coupling the diesel to a generator eliminates this problem.  There seems to be a lack of explanation as to WHY.  It should be emphasised that power still needs to be transmitted to the generator or alternator via a simple gearbox but this is advantageous because;
1) Mere cables transmit the power to the axle traction motors, not a complex system of rods
2) Sending power to a generator via a low powerband (i.e. diesel) is analogous to sending power to a propeller, in that one gear ratio is enough, unlike sending power to wheels, where several ratios are necessary.  This is because the high friction between wheels and contact surface requires a low gear for takeoff to avoid stalling, and higher gears thereafter, since the output shaft moves relative to vehicle speed and would over-rev the engine if just one gear was available.  In a generator or alternator, the force is magnetism, not a high friction surface so a high gear is fine since the magnetism is not great enough to stall the engine.  The result is that the diesel-electric system puts the diesel’s low powerband to best use.
I really want an engineer to check the above!
:Yes but diesel locos that don't use an electrical transmission make use of this great thing called a torque converter, or a fluid coupling. That removes the needs for many gears, British Rail had a fleet of Diesel-Hydraulic locos. Indeed, I believe such transmissions were proved to be much more efficient in transmission of power than electrical systems. I remember hearing of a high-power experimental loco, however the reliability of the system employed was low.
--88.107.193.52 20:41, 11 August 2007 (UTC)
replies: text: "power still needs to be transmitted to the generator or alternator via a simple gearbox" This is incorrect.  In most cases the diesel engine is direct-coupled to the generator. Biscuittin (talk) 15:26, 23 March 2009 (UTC)
replies: text: "diesel locos that don't use an electrical transmission make use of this great thing called a torque converter, or a fluid coupling. That removes the needs for many gears".  This is only partially correct.  A torque converter provides torque multiplication but this is not usually enough and there are likely to be between 2 and 4 gears as well.  A fluid coupling is basically a clutch and does not provide any torque multiplication so 4, or more, gears will be needed. Biscuittin (talk) 15:41, 23 March 2009 (UTC)
thread_title:  Concerning the advantages of diesel-electric locomotive or DEMU power 

message: I've noticed that the gallery sections has boatloads of photos in it now. If they aren't already in the articles on the individual trains than perhaps they should be moved there. Also, many of them have very detailed captions - I feel this page is for a world audience and drilling down to the exact operator, service run, number and livery is a bit too detailed. Possible just a 'very good image or two for each country, showing a distinctive or representative image of the most popular class of DMU, set in countryside that also represents the country. The millions of interior shots don't seem do much either - they pretty much just show 'our trains have seats'. Finally, there are a few photos of trains from countries that are not represented.  If people who know about the DMUs in those countries please add a short history of DMUs in the country - when they were first introduced, links to classes, etc. Wongm 05:33, 21 August 2007 (UTC)
thread_title:  Too many photos? 

message: FRA "compliant" and European Railway compliant are basically the same "standard" ... both demand that a a passenger train meet the local railways crashworthiness standards.
The fact that the Americans demand much more HEAVYWEIGHT passengers doesn't mean that europeans could accept LightRail units without them complying to heavy-rail standards ... that's why seemingly light rail trains (such as the bombardier Talent) are considered heavy rail. 
This "my DMU is better than yours" seems like the one about the french TGV's being or not EMU's ... the front/back cars don't carry passengers PRECISELY because of the crashworthiness demanded for traveling in european railwas above 100mph/ 160km/h (wich in recent years seems to be discarded as if it was not "stilish") Sotavento (talk) 04:56, 25 June 2009 (UTC)
replies: text: Yes, the problem is that people in the U.S. tend to call anything which doesn't meet their heavy-rail standards a light-rail vehicle, because it can only operate under light-rail rules in their country. So, when trains like the Talent and Desiro are accepted onto the main line in Europe, they take that to mean that European railway standards allow light-rail vehicles onto the main line without meeting 'real' (i.e. U.S.) heavy-rail requirements. David Arthur (talk) 21:17, 25 June 2009 (UTC)
thread_title:  DMU vs, Diesel trains 

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thread_title:  External links modified 

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message: "gulflander", this unit is not a multiple unit. it is a railcar and trailer, that MUST be turned for the return trip.
qr also operated railmotors(dmu's?) of the 1900, 2000 classes from the mid fifties.
Pga1965 (talk) 14:13, 4 February 2020 (UTC)
thread_title:  queensland railways (QR) 

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message: Kenya is currently lumped in the Asia section.
does it make sense to create a new Africa section for just one country, or to rename the current Asia/Australasia section to also include Africa? A Carbine Flash (talk) 21:43, 24 April 2023 (UTC)
thread_title:  Africa section for Kenya 

message: Türkiye operates DMU for a very long time. As far as i know Hyundai DMU's are used for crowded Adana-Mersin line rather than classical trains.
Recently Türasas designed an indigenous DMU for regional lines of TCDD (Turkish State Railroads)
turasas.gov.tr/dmu-diesel-train-set
And these sets are currently in service:
Youtube> G4BQfBodU-U 178.244.74.31 (talk) 07:15, 27 September 2023 (UTC)
thread_title:  Türkiye section should be added