1st radius gets a lot of hassle. On my layout I have a complete R1 loop and most of my recent stock runs fine on it. That includes: All Hornby 0-6-0s, B12, A4, Pecket, J15, Pullman coaches. Bachman Prairie, USA tank, DJ J94 and O2. The J15 is a lovely model. For a tender loco that would be my choice.