Lionel Part Number Prefixes - 600, 601, 610, 620, etc.

600 = xxxx (4 digit number) post war & MPC  like 3464 or 8851

610 = xxxxx (5 digit number) like 18010 that begin with a 1

620 = same as 610 but begins with a 2

630 = same as 610 but begins with a 3

640 = American flyer

650 = special & club cars

680 =

690 = tender numbers for 600- engines

691 = tenders for 610- engines

6sp =

This is not all of them.

@Lionel Parts posted:

600 = xxxx (4 digit number) post war & MPC  like 3464 or 8851

610 = xxxxx (5 digit number) like 18010 that begin with a 1

620 = same as 610 but begins with a 2

630 = same as 610 but begins with a 3

640 = American flyer

650 = special & club cars

680 =

690 = tender numbers for 600- engines

691 = tenders for 610- engines

6sp =

This is not all of them.

Thank you so much! I wonder if you might know the difference between 610, 620, and 630, was it just points in time that Lionel decided to change up their part numbering scheme? Did the break in part numbering occur at points in time when Lionel was changing hands? Changing locations? Or perhaps because they were simply running out of available numbers? There is an awful lot of rolling stock with 8xxx and more to the point, 9xxx part numbers out there 

Thanks again for sharing your info!

George

One other thing to keep in mind, look at the parts list for 6-18010 (PRR Scale turbine)

for example, the boiler front is listed as

Ignore the third digit, 0 in this case so you can see how the 6-18010 figures into the PN.

The last 3 digits define the actual part, 024 in this case.