If you look closely the front shaft is connected to the gear away from the spur only the rear shaft is connected to the spur side only,with the layshaft spining one way and each front and rear shafts have opposite contact points they can't go opposite ways !
If they wanted them to go opposite why did they bother to put two gears on the layshaft as it would only need one for them to go opposite ways!
Have a look @ the pics and imagine each gear tuning it becomes quiet clear!
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