Yes, this question drives the discussion further as the size of the steam engine that you want to buy may demand you to look for a suitable place to hold it either in office or in your production unit or at home as an antique piece. If you want to just operate at the place where it is placed then the small size should be fine, but if you want it to move around in the campus as an attraction for the viewers then you may have to go for the big size. Apart from size you should also pay attention to the type of material that is used to make its body.
For example, for the small size steam engines, it is good to go with the brass material as it is affordable as the size of the engine is small. Also, the classy look that comes with the brass material would be an additional attraction to the place where you host the steam engine and let it run for the part of the day where the viewers would be more. For the large size of the steam engines it is good to go with the steal material. However, you could look at the price that is coated for the top scale model steam engines that are made of these two materials.
When you look at the cost it would give you an overview of which one would be best for you. You could evaluate the cost, space that it occupies and the value that it gives to the premises in which you would like to have it running either occasionally or at some regular intervals as is researched or investigated by you. Once you have the answers for all the questions then you could shop for the steam engine of your choice and get it delivered to the shipping address provided by you.