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Class 251 DMU 'Blue Pullman'

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YouChoos installation guides

Listen to a recording of this project

Configuration: 2'Bo'+Bo'2'+2'2'+2'2'+2'Bo'+Bo'2' (6 car)
Prime Mover: NBL/MAN V12 Supercharged (2)
Recordings: Various

Choose which project variant you want...

If you plan to purchase 2 Blue Pullman sound decoders to use at either end of a train, include a note with the order so we know to load the 'rear' project onto the second decoder. The 'rear' project includes different engine sequences, announcements and compressor sounds, and the pair together sound fantastic! In addition, both ends will have 'directional' sounds where appropriate.


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F0AUX1/FOfwd + AUX2/FOrev directional lights
F7SetOff Flange
F9Comms Buzzer
F10Brake Release
F11Doors Closing Slams
F12Guard's Whistle
F13Coupling Up
F14Coupling Up
F16Onboard Announcement
F17Coach Rattle
F18Wheel Flange
F19Clickety Clack
F20Volume Decrease
F21Volume Increase


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F0AUX1/FOfwd + AUX2/FOrev directional lights
F2Active Brake
F5Comms Buzzer
F7Notch Up
F8Brake Release
F9Guard's Whistle
F10SetOff Flange
F11Coupling Up
F14Wheel Flange
F15Clickety Clack
F16Doors Closing Slams
F17Coupling Up
F20ShuntingMode+Half Shunt
F23Onboard Announcement
F24Coach Rattle
F27Volume Decrease
F28Volume Increase

Function Key assignments listed above are the defaults for this locomotive type. If you would like a different configuration, or features swapping out (such as replacing sounds with others in the YouChoos library, or even your own sounds), then please contact us with your preferences at time of order.

Some sounds in a project may be 'generic', but the key parts of a project are always genuine sounds from the correct locomotive, unless otherwise stated.

Active Braking Option

All Zimo sound decoders now provide a facility called Active Braking. This means that the loco will coast gently to a halt if the throttle is simply backed-off, using the default CVs for momentum, and in addition (CV#3 and CV#4), a dedicated Function Key is defined as the brake key, which will slow the loco at a greater rate (defined in CV#349) - just like the real thing - you have to use the brakes to slow down quickly! The longer you hold the brake key down for, the harder the braking effect.

By default, YouChoos immersiveDrive projects DO include this feature (braking on F2), but YouChoos Traditional projects do NOT define a brake key (they provide throttle-based deceleration, which is traditionally better understood in model railway circles). However, the Active Braking feature can be included/excluded as you wish - please email us with this requirement, together with which Function Key you would like it to appear on (F2 is most commonly used), and we can easily customise the project for your order.

Quick Select Option

Zimo sound decoders provide the facility to switch between 2 engine schemes on-the-fly at the press of a Function Key (normally F5). For example, switching between light and heavy chuffs on a steam loco, or switching between diesel and electric engines on a hybrid (like the Class 73). In fact, the project may have many engine sets loaded, but only 2 are accessible from the Quick Select feature.

Many YouChoos Traditional projects include this feature (primarily steam) and others will be added as projects are updated in the future. All YouChoos immersiveDrive steam projects include this feature where QuickSelect will change from the default of a 'heavy' engine to a 'light' engine, where the chuffs are quieter.

Shunting Option

A Function Key may be defined to activate the Shunting feature, which normally has the effect of reducing the effects of momentum (CV#3 and CV#4) to 1/4 the normal rate, thus accelerating and decelerating is more responsive - suitable for shunting the loco when it is not pulling a load. In addition, we usually reduce the requested speed to half when shunting mode is activated - this is true of all of the immersiveDrive projects, which have this feature as standard, normally on F20.

Where a project includes a light engine feature (see Quick Select above), it can be effective to have the same Function Key activate Shunting.

By default, YouChoos Traditional projects do NOT include a Function Key dedicated for this purpose, but YouChoos immersiveDrive projects do. Let us know if you want its' inclusion/exclusion in your decoder changing at the time of ordering.

A bit of YouChoos poster art for your enjoyment!