A 201 has also reached the magic 120 mark with a Mk IV set.
The highest speed ever achieved by an 071 was 116mph, on a test run shortly after delivery.
Welcome aboard! I've seen your layouts at exhibitions over the past few years and I must say I enjoy them a lot. Looking forward to seeing how your Limerick project develops!
Heard a story not so long ago that proved the 201s could do those kind of speeds... although I'm not sure they'd last long doing it all the time! An 071 properly prepped wouldn't be too far off, either.
There is another DIY grassmaster design that is essentially identical to the one Noch makes, and can be made for a fraction of the price. I can't find the link to the instructions for building it, but it's the same one Everard Junction uses: