modal verb 'would'

Hi,

I think you can use 'would' to make a past time reference as well as to the present and future time references.

1. Expressing present time politeness:

Would you mind moving to the left, I have to sit with my baby?

Of course, It's my pleasure.

2. Making a past time reference:

When I was three years old, I would play with toy trains.

3. Making a past time conditional reference:

If I had had a toy train, I would have played with it all day.

Between no. 2. and 3, would you say both 'would play' and 'would have played' convey the sense of past-ness?? Are they functional the same for the purpose of expressing teh past-ness?