Here's a summary of the history of Lionel Trains during their first 90 years:

*Early Days (1900-1920s) Founded in 1900 by Joshua Lionel Cowen.

  Early models were simple and focused on novelty.

   Introduction of the "Standard Gauge" track system in 1906 was a significant innovation.

   Gradual growth and increasing popularity.

Roaring Twenties (1920s):

   Period of significant growth and expansion.

   Introduction of the O-gauge scale in 1925, becoming a popular standard.

    Elaborate and detailed model trains gained popularity.

 The Great Depression (1930s):

   Sales and profits declined due to economic hardship.

   Innovation continued with new designs and features.

World War II (1940s):

    Production shifted towards wartime needs.

    Toy train production largely halted.

Post-War Boom (1950s):

    Resurgence of popularity and high demand for Lionel trains.

    Iconic models and innovative features were introduced.

   A golden age for the company.

 Later Decades (1960s-1990s):

   Faced increased competition from other toy manufacturers.

    Experienced ups and downs in sales and popularity.

    Continued to innovate and introduce new models.

 Key Innovations:

   Three-rail track system

   O-gauge scale

   Transformers

   Detailed and realistic models

   Licensed models based on real trains

In essence: Lionel Trains has a rich history marked by innovation, periods of great success, and challenges. 

They have played a significant role in shaping the model train hobby for generations of enthusiasts.