The kids should be introduced to the rhythms aurally before any attempt to explain the written notation. Do echo chanting with rhymes and songs and clapping etc, then teach the dotted rhythm by rote in some pieces and finally attempt to teach the counting."Lon - don bridge is fal - ling down." Echo, clap ...Notice I can make a click of my tongue after "Lon" - "Lon-(click)-don bridge ..."Then show them the note and the dot is the click you wait for.
Musicrebel4u, are you familiar with the Waldorf schools and Rudolf Steiner? This reminds me of how multiplication was taught. "3X" was an old man with a cane. He walked step-step-cane, step-step-cane. the children walked a round being the old man. Then they used beautiful colors and wrote 1 2 *3* 4 5 *6* 7 8 [*9* - It was still the old man and his cane. Then the used more beautiful colours and wrote 3, 6, 9, 12. Then they could multiply 4X3 = 12. It was inside them in pictures, right-brain, emotion-body-mind. Your train reminds me of this in some respects.
I have tried everything I know and none of it is working. I have had them tap the beat with their feet and try to clap the rhythm, I turn on the metronome and have them feel the beat and I talk to them about the upbeats and that the eighth note after the dotted quarter note comes on the off beat after beat 2, etc. I need CREATIVE ways to teach it. I don't know how these kids don't get it. It is a mystery to me.