Hi Sorin,
Welcome to the group, the company I work for has a shared services office in Iasi, I always enjoy going there and I get well looked after.?
Narrow Gauge Railways in Mid Wales (1850-1870) by James I C Boyd has drawings of both the Davies & Metcalfe version and Swindon built locos along with some useful photographs.
Not sure of the availability of this publication.?
Regards,
Mark.?