Blueprints

Here are some blueprints of the QR trains that I found, in no particular order.

ICE

1: QR ICE EMD EMM

Original

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Source: https://www.steammachine.com/prototype_archive/qr_electrics/qr_electric.html

Alternate

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Source: https://www.the-blueprints.com/blueprints/trains/trains-n-q/16422/view/qr_ice_emd_emm/

EMU

1: QR EMU DM M DT (1983)

Original

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Source: https://www.steammachine.com/prototype_archive/qr_electrics/qr_electric.html

Alternate

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Source: https://www.the-blueprints.com/blueprints/trains/trains-n-q/16419/view/qr_emu_dm_m_dt_1983/

2: QR EMU DM M (1979)

Original

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Source: https://www.steammachine.com/prototype_archive/qr_electrics/qr_electric.html

Alternate

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Source: https://www.the-blueprints.com/blueprints/trains/trains-n-q/16418/view/qr_emu_dm_m_1979/

3: QR EMU DT (1979)

Original

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Source: https://www.steammachine.com/prototype_archive/qr_electrics/qr_electric.html

Alternate

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Source: https://www.the-blueprints.com/blueprints/trains/trains-n-q/16420/view/qr_emu_dt_1979/

IMU

1: IMU120 layout

Source archived here - see figure A2

Carriage 1

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Carriage 2

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Carriage 3

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SMU

1: SMU200 layout

May also be SMU220, but I can't tell the difference.

Source archived here - see figure A1

Carriage 1

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Carriage 2

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Carriage 3

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1B: SMU200 layout but like a blueprint design

It's in the dimensions of a horizontal A1 / A2 / A3 page, so you should be able to print it. It's like 13244 x 9354 or something like that so it should look good when it's large.