Mixed results today

Spent some time separating, cleaning and preparing the remaining parts for the main frames today. Silver soldered the front 'bogie bolster' which went fine. Prepared the main frames for soldering but found that I couldn't get enough heat into the frames for the solder to melt and flow properly. Probably didn't help that the temperature outside was only a few degrees above zero and it was snowing at the time I was out there! Have ordered a brazing hearth from CuP Alloys today, along with some more solder and flux, to see if that makes a difference.