Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

  Thanks for the side by side pic's of your 4149/ 7 & 9 models. I like seeing the slight changes Marklin made in manufacturing. The sight glass fitting for instance were changed to the heavier block style on the 9 model from the lighter ones on the 7. The heavier block style allows you to replace the glass without removing the block fitting as the glass will pass through from the top. I've never had the other style sight glass fittings like on your 7 but can see replacing the glass would be more difficult and probably the reason for the upgrade.

 Nice find on your new addition. I haven't bought an engine in a few years but it would have motivated me.