I have no idea what format you are using but here's what I do...
Observation - child is making lines with the cars putting them in size order;
Main link to Eyfs - PSR&N counting;
Evaluation - the child has also been observed lining up trains at home by mum. I think he may have a trajectory (straight line) schema;
Next steps planning - offer activities which link to trajectory schema such as water play, rolling things in straight lines, drawing lines in chalk on the patio and see if he enjoys them.
Hth